Node.js Crawl Website: Proxy IP for Efficient Collection

Replacing the Doorman with a Transformer - Proxy IP Anti-Blocking Principle

To give a grounded example, the site is like a neighborhood, each visitor has a door number (IP address). When you knock on the door a dozen times in a row with the same license plate number (frequent requests), the property (anti-climbing system) will drive you away as a flyer. This time if you canChanging different overalls every day + changing faces(switching proxy IPs) and the security guards won't recognize it as the same person.

Last year, a friend doing e-commerce, crawling competitor prices were ban without temper. Later to the crawler installed a "morphing device" (proxy IP pool), the next day to pick up the complete data. Here is a key point:Don't use free agents.Those are like fake work permits picked up off the street, they show up in minutes.

Hands-On Transformer - Node.js Configuration in Action

First prepare a crawler toolkit that will transform, here is a demo with axios-proxy. Pay attention to this configuration detail, many tutorials leave it out:

const axios = require('axios');
const { HttpsProxyAgent } = require('https-proxy-agent');

// replace this with your own ipipgo account information
const proxyConfig = {
  host: 'gw.ipipgo.com', // don't misspell this address
  
  auth: 'your account:password' // don't use the colon in Chinese!
};

async function stealthCrawler(url) {
  try {
    const agent = new HttpsProxyAgent(`http://${proxyConfig.auth}@${proxyConfig.host}:${proxyConfig.port}`);

    const response = await axios.get(url, {
      httpsAgent: agent, {
      timeout: 8000 // set the timeout to be short, change IPs immediately if you get stuck
    }); const response = await axios.get(url)

    return response.data; } catch (error) { return axios.get(url)
  } catch (error) {
    console.log('Caught an exception, time to change IP:', error.message); // Here you can access the ipipgo auto-change interface.
    // This is where you can tap into ipipgo's auto-changer interface.
  }
}

Pay attention to the timeout parameter in the code, this is very important. Some proxy nodes may have a problem, so setting a timeout of 8 seconds can prevent the whole program from getting stuck. If you encounter a timeout, you can trigger the IP switching mechanism. ipipgo's background has an automatic switching API that can be called directly.

A practical guide to avoiding the pit

I stepped on these mines last year while doing book price monitoring for a client:

• IP switching too regular: Don't change IPs on time at all hours, add a random delay (30-300 seconds)
• give the game away by requesting a head of steam (idiom); to unmask one's true nature: Remember to bring Referer and User-Agent, and use ipipgo's browser fingerprinting library!
• CAPTCHA raid

  : Prepare a coding platform backup, recommended to use ipipgo's intelligent verification code cracking services